Rivet setting implement



Sept. 19, 1944; s. l. GooKlN RIVET SETTING IMPLEMENT Filed Aug. 17. 1942 PatenvtedjSept. 19, 1.944. l

Sylvester L. Gookin, Quincy, Mass., assigner to United Shoe Machinery Corporation, Flemington, N. J., a. corporation of New Jersey Application Aug-nsti?, '1942, Serial No. 455,936

7 Claims.

4equipped to do this requires a pull rod in telescopi'c relation to a buttress or anvil, and the pull rod requires a screw portion to be screwed into the thread inside the rivet. The' implement also requires means for pulling the pull rod and an attached rivet against the anvil with sufficient force to upset or bulge the tubular shank of the rivet.

The problem with which the present invention is concerned is that of saving time in coupling the pull rod and a rivet and thereafter releasing the pull rod from the clenched rivet. nine convolutions of screw thread should be interengaged to avoid stripping the thread of a. rivet when the pulling force is applied, and the full clenching effect obtainable from the pulling means requires thehead or flange of the rivet to be seated against the anvil before. any of the pulling movement is spent.

The time saving improvement embodied in the illustrated implement is provided by a construction that includes a slider arranged to be moved manually along the barrel of the housing that constitutes the body of the implement. The slider cooperates with a steep screw thread formed on a rotary shaft by which the pull rod is carried, and the parts are so organized that the pull rod will be rotated in one direction when the slider is moved toward the anvil and rotated in the opposite direction when the slider is retracted. Moreover, the parts are designed to insure the required number of revolutions of the pull rod in consequence of moving the slider through its entire range of travel. Consequently,l

once a rivet has been installed by being clenched a simple pull of the handle of the slider away from the rivet is the only act necessary to release the [pull rod and removethe implement. The value of this improvement with respect .to mass production may be appreciated when it is con Fig. 1 is a side elevation of a rivet setting implement embodying the present invention;v

comprising the pull rod and the shaft by which,

it is carried;

Fig. 5 is an elevation partly broken out of the slider;

Fig. 6 is a sectional view of the pull sleeve by which the operative movement is imparted lto the pull rod;

Fig. 7 is a sectional elevation indicated by line VII-VII in Fig. l; and

Fig. 8 is'a longitudinal section of a rivet of the tyIpe for which the setting implement is designed.

The body of the implement is in the form of a tube or barrel I0 and is provided with a boss II to receive a 'fulcrum pin l2. A hand lever I3 is mounted on the pin I2. Its purposeis to apply the force for clenching a tubular rivet of the type shown in Fig. 8.

Rivets of this type are made of a special alloy having sufficient ductility to be collapsed endwise and thus bulged between their ends to form a clenching flange or collar indicated at I4 in Fig. 3. A head or flange I5 is initially formed at one end of the rivet and an internal screw thread I6 is provided in the opposite end. This thread sustains the pulling force by which the rivet is to be collapsed and clenched and should have eight or nine convolutions to avoid being stripped. The shank fportion I1 connecting the threaded end and the head end is counterbored for a sufficient length to provide a collapsible portion in addition to the portion that will extend through the sheet material 42.

The screw thread I6 is of a size to receive an external thread I8 on one end of a pull rod 20. The thread I8 comprises at least as many 'convolutions as the thread I6 and may comprise a few more. The pull rod 1s aflixed to a shaft 22,

the rear end of the rod having a screw thread s 2 I and the shaft having a tapped socket to receive sidered that many millions of rivets of this type are being used in the aircraft industries` Referring to the drawing,

it. The pull rodv should be screwed tightly into the shaft to avoid relative rotation Vwhen these parts areassembled, but thev connection may be reinforced by a. set screw.

The shaft 22 is also provided with a. coarse screw thread 23 o f a pitch so steep as to evolve rotation about its axis from movement lengthwise of its axis. and the extent of this thread is sumcient to produce as many revolutions of the pull rod| as may be necessary to engage the full number of convolutions of the screw thread I8 in a rivet, namely, nine in the instant exanrple.

The means for rotating the shaft 22 is preferably a tubular slider or sleeve 24 into which the shaft extends. The sleeve is telescopically rela-ted to the barrel I to be moved endwise therein. A smooth cylindrical portion 28 of the sleeve has a bearing in the barrel while a smaller portion of the sleeve has a bearing in a bushing 26 screwed into the rear end of the barrel. The sleeve projects beyond this bushing and its outer end is provided with an operating handle preferably in the form of a knob 21. A short stem 28 by which the sleeve and the knob are coupled limits the inward travel of the sleeve by abutting the rear end of the shaft 22. The outward travel is limited by the bushing 26 and a shoulder 29 formed on the sleeve. A spline 30 formed in the bushing (Fig. 7) occupies a slot 3I in the sleeve to prevent rotation of the latter when the parts are assembled. The bearing portion 25 of the sleeve is provided with a few convolutions of internal thread 28 mating the screw thread 23 of the shaft and constituting a follower or operating connection, f

The forward end of the barrel I0 is provided with a centrally bored anvil 32 through which the pull rod extends and in which it may turn and move endwise. The space .between the anvil and the screw sleeve 24 is occupied by a pull sleeve 33 through which a cross pin 34 extends. This pin is pressed tightly in the pull sleeve and its ends project through slots 35 in the housing and through holes 36 inthe cheeks 31 of the lever I3. The pull rod extends loosely through a hole 33 in the pin 34. A tension spring 38 normally maintains'the lever in the position shown in Fig. 1, but when the handle of the lever is moved toward the barrel I8 the pull sleeve 33 is retracted from the anvil. This movement of the pull sleeve is utilized to collapse and clench a rivet and for this purpose an operating connection of the sleeve and the pull rod is provided by cooperative screw threads 40 and 4I on the shaft and .in sleeve respectively.

The gauge of the threads 40 and 4I is preferably the same as that of the threads I6 and I8 Vfor the following reason: when the shaft and the pull rod are being rotated to screw the pull rod into a rivet they should advance endwise without displacing the rivet from the anvil and without pulling it against the anvil. In practice,

rivet and engage all the convolutions thereof.-

Now, while the rivet is held only by the pull rod, the operator will insert it into a hole previously made in a work piece and grasp the barrel I0 and the handle I3 Iwith the hand previously used to hold the rivet. While operating the handle I3 the operator will press the anvil lightly against the rivet to maintain the flange of the rivet against the work piece. A full stroke of the handle I8 will collapse and clench the rivet as represented in Fig. 3 in which a work piece 42 is shown in section.

The operator now has only to release the handle I3 and pull the knob 21 away from the anvil to its outer limit of travel. `The spring 38 returns the lever I3 to its initial position and relieves the stress between the threads I6 and I8. Retracting the knob 21 unscrews the pull rod with enough turns to release it from the clenched rivet.

Having described my invention what I claim as new and desire to secure by Letters Patent of the United States is: f

l. A rivet setting implement comprising a tubular housing having an anvil at one end provided with an axially extending bore, a pull rod extending freely through said bore and having an external screw thread projecting beyond the anvil to be screwed into an internally threaded 4 tubular rivet, 'a rotatable and axially movable the pull when the slider 24 is being advanced to screw the pull rod into a rivet the pull sleeve 33 will remain stationary. Consequently, the rotary assemblage comprising the shaft and the. pull rod will be advanced by the threads 40 and-4I with the same amount of travel as that required to consummate the screw connection between the rivet and the pull rod. n

The preferred mode of operation is as follows: if thesleeve 24 is not fully retracted the user will first retract the knob 21 to place the shoulder 23 against the bushing 28. This step will cause the threads 40, 4I to retract the pull rod through the anvil just far enough to reduce the projecting portion of the pull rod to a length equal to or slightly less than the length of the counterbore of a rivet. NowI while a rivet is held between the thumb and forefinger .of one hand, the counterbore of the rivet may be slipped shaft located in the housing and fastened to said pull-rod, a sleeve telescopically related to the housing. Said sleeve and said shaft having interengaged portions by which the shaft and the pull rod may be rotated in consequence of moving the sleeve endwise, a thrust member located l in the housing to shift said shaft and the pull rod endwise, said thrust member and the shaft having interengaged screw threads oi' the same gauge and hand as the screw thread first specied, and manually operable means connecting the housing and said thrust'member to upset a screwed-on rivet by pulling it against said anvil.

2. A rivet setting implement comprising a tubular housing having an anvil at one end provided with an axially extending bore, two sleeves arranged in a series in the housing and both movable endwise thereof, one having an inside screw thread of fine gauge and the other having an inside screw thread of coarse gauge and steep pitch, manually engageable means by which to move said other sleeve toward and from the one rst specified, a shaft connecting said sleeves and having screw threads of gauge and pitch to mate those of the sleeves, a pull rod carried by said shaft and extending through and beyond said anvil, the projecting end of said pull rod having anv outside screw thread to engage an inside thread -in a tubular rivet, and manually operable means connecting the housing and the external screw thread projecting beyond the any vil to be screwed into an internally threaded tubular rivet, a rotatable and axially movable shaft by which said pull rod is carried, said shaft being inside the housing, 'manually operable means connecting the housing and said shaft to upset a rivet screwed on said pull rod by pulling it against the anvil, a sleeve telescoped within and extending outwardly of said housing and having a portion interengaged with said shaft whereby longitudinal movement axially of said sleeve with respect to said housing will rotate said shaft and pull rod to thread or unthread a rivet from the externally threaded portion projecting beyond the anvil, andmeans for preventing rotation of said sleeve with respect to said housing during its longitudinal movement.

4. A rivet setting implement comprising a tubular housing having an anvil at one end provided with an axially extending bore, a pull rodextending freely through said bore and having an external screw thread projecting beyond the anvil to be screwed into an internally threaded tubular rivet, a rotatable and axially' movable shaft by which said pull rod is carried, said shaft being inside the housing, manually operable means connecting the housing and said shaft to upset a rivet screwed on said pull rod by pulling it against the anvil, and a sleeve telea bore in concentric relation to the axis of the scoped within said housing and having ahandle extending axially outwardly of said housing, said sleeve. having aV portion' interengaged with said shaft whereby longitudinal movement of i said sleeve with respect to said housing will rotate said shaft and pull rod to thread or unthread a rivet from vthe externally threaded portion projecting beyond the anvil.

5. A rivet setting implement comprising a tubular housing having an anvil at one end provided with a bore in concentric relation to the axis of the housing, a pull rod extending freely through said bore and having an external screw thread projecting beyond the anvil to be screwed into an internally threaded tubular rivet, a rotatable and axially movable shaft to which said pull rod is affixed, said shaftbeing inside the housing, manually operable means connecting the housing and said shaft to upset a rivet screwed on said pull rod by pulling itagainst the anvil, a slidable sleeve extending into the housing through the other end thereof, said sleeve having a portion inter-engaged with. said shaft whereby longitudinal movement lof 'said sleeve with respect to said shaft will rotate the housing, a pull rod 4extending freely through said bore and having an external'screw thread projecting beyond the anvil to be screwed into an internally threaded tubular rivet, a rotatable and axially movable shaft 4to, whichV said pull rod is air'xed, said shaft'being inside the housing, manually operable means connecting the housing andsaid shaft to upseta rivet. screwed on said pull rod by pulling it against thev anvil, and a sleeve extending intothe housing through said bushing and having a shoulder inside: the housing larger than the internalpdiamete'r offsaid bushing, the sleeve also having an internal portion interengaged with saidshaft whereby movement along said axis with, respect;toysaidlfshaft will rotate said shaft and pull'rodfto'thread or unthread a vrivet from the externallyi threaded portion projecting beyond the anvil,fsaid:gshoulder and the bushing being adapted t'ofarrest movement of the sleeve away from the anvil.v v

7. VA rivet setting implement comprising a tubu lar housing having an anvil Vat one end providedV with an axially extending-bore, a pull rod extending freely through said bore and having an external' screw thread projecting beyond the anvil to be screwed into anrinternally threaded tubular rivet, a rotatable and. axially movable shaft by which said pull rod' is carried, said shaft being inside the housing, manually operable means connecting the housing and said shaft to upset a rivet screwed on said pull rod by pulling it against the anvil, and a sleeve telescoped within and extending outwardly ofsaid housing and having` a portion interengaged with said shaft whereby longitudinal movement axially. of said sleeve with respect to said-housing will rotate said shaft and pull rod to thread or unthread a rivet from the externally threaded portion projecting beyond the anvil.

sYLvEsTER L. GooKIN. 

